[Stoves] Using a differential windlass as motive power for stove

[Crispin Pemberton-Pigott]

Dear Steve and All

>...Now, if we use Drew's weight system, all THAT energy is stored in a
>lifted weight. The energy required to lift a weight of mass M, through
>height h = Mgh, where g is the gravitational acceleration constant, g =
>9.81 m/s/s
>Lets assume we lift it
>
>Energy = Mgh or  1800J = M x 9.81 x 2
>
>Rearranging for M, 1800/2/9.81 ~ 90kg,

OK so far.  I think 3 watts is unnecessary.  One watt would be enough.

Also if we are taking this tack, think about a more efficient fan rather 
than a more efficient motive mechanism.  Perhaps we can get the mass down to 
15 kg per 10 minutes.

Also, the fan is needed for starting really hot and clean, but after a 
while, the stove could generate its own draft by chimney, other heat, or 
electrical power.

As a design exercise this is really good.  Perhaps a spring is a better 
store of energy (wooden or plastic) than a lifted weight.  The fam might be 
quite slow, radial and thin to prouce the air volume/pressure required.  We 
have no talked much about what is really needed in that regard.

Regards
Crispin